Composition Chart

import { clsx, type ClassValue } from "clsx"
import { twMerge } from "tailwind-merge"

export function cn(...inputs: ClassValue[]) {
  return twMerge(clsx(inputs))
}

"use client";

import { useEffect, useState } from "react";

/**
 * Returns true only on devices that have a true hover (mouse / trackpad).
 * Touch devices fire phantom `:hover` on tap that sticks until tap-elsewhere
 * — gate hover-only effects (scale lifts, magnetic pulls) behind this.
 */
export function useHoverCapable() {
  const [canHover, setCanHover] = useState(false);

  useEffect(() => {
    if (typeof window === "undefined" || !window.matchMedia) return;
    const mq = window.matchMedia("(hover: hover) and (pointer: fine)");
    const update = () => setCanHover(mq.matches);
    update();
    mq.addEventListener?.("change", update);
    return () => mq.removeEventListener?.("change", update);
  }, []);

  return canHover;
}

// Shared motion tokens. Easing curves mirror the CSS custom properties in
// globals.css; springs are the canonical physics used across components.
// Strong custom variants — defaults like `ease-in`/`ease-out` feel weak.

export const EASE_OUT = [0.16, 1, 0.3, 1] as const;
export const EASE_IN_OUT = [0.77, 0, 0.175, 1] as const;
export const EASE_DRAWER = [0.32, 0.72, 0, 1] as const;

/** CSS string form of EASE_OUT for inline style transitions. */
export const EASE_OUT_CSS = "cubic-bezier(0.16, 1, 0.3, 1)";

/** Press feedback on buttons and other tappable surfaces. */
export const SPRING_PRESS = {
  type: "spring",
  stiffness: 500,
  damping: 30,
  mass: 0.6,
} as const;

/** Content swaps — label/icon slots trading places inside a control. */
export const SPRING_SWAP = {
  type: "spring",
  stiffness: 460,
  damping: 30,
  mass: 0.55,
} as const;

/** Overlay panel entrances — modals and sheets summoned by pointer. */
export const SPRING_PANEL = {
  type: "spring",
  stiffness: 420,
  damping: 40,
  mass: 0.5,
} as const;

/** Shared-layout glides — pills, indicators and panels morphing between positions. */
export const SPRING_LAYOUT = {
  type: "spring",
  stiffness: 360,
  damping: 32,
  mass: 0.6,
} as const;

/** Cursor-follow physics for decorative mouse tracking (magnetic, tilt, dock). */
export const SPRING_MOUSE = {
  stiffness: 200,
  damping: 15,
  mass: 0.3,
} as const;

/** Dragged handles and fills (sliders) — critically damped `useSpring` config,
 * so the value follows the pointer butterily and never rebounds off an end. */
export const SPRING_GLIDE = {
  stiffness: 700,
  damping: 50,
  mass: 0.5,
} as const;

"use client";

import { type RefObject, useEffect } from "react";

/**
 * What the dismissing gesture does to the control it landed on.
 *
 * `"pass-through"` is the platform norm (native popover light-dismiss): the
 * tap closes the overlay *and* activates whatever was under it. Use
 * `"consume"` where the open overlay sits over or beside controls that would
 * be costly to trigger by accident — the dismissal then swallows the
 * activation too, so the gesture only closes.
 */
export type DismissBehavior = "pass-through" | "consume";

export interface DismissOptions {
  /** Default `"pass-through"`. */
  behavior?: DismissBehavior;
  /** Dismiss on Escape as well. Default true. */
  escape?: boolean;
  /** Return true for an outside target that should *not* dismiss. Must be stable. */
  ignore?: (target: Element) => boolean;
}

/**
 * What every currently open dismiss scope counts as inside itself. A consumed
 * dismissal reads this to tell a stray gesture from one that belongs to an
 * overlay in front of it: overlays have no shared z-order to consult, but the
 * one the gesture landed in has said as much by registering it.
 */
const openScopes = new Set<(target: Element) => boolean>();

function claimedByAnotherScope(
  self: (target: Element) => boolean,
  target: Element,
) {
  for (const scope of openScopes) {
    if (scope !== self && scope(target)) return true;
  }
  return false;
}

// preventDefault on pointerdown does not suppress the click that follows, so
// consuming a gesture means swallowing that click itself. The swallower
// deliberately outlives the effect that installed it — the dismissal it
// belongs to has already unmounted or re-rendered by the time the click lands.
// It releases on that click, or on the next gesture if the pointer is dragged
// away and no click ever arrives, so it can never eat a later one. A keydown
// releases it too: a gesture that ends with neither a click nor a cancel would
// otherwise leave it armed, and the click Enter synthesizes on some focused
// control is not the one this dismissal was owed.
function consumeActivation(source: Event) {
  const swallow = (event: MouseEvent) => {
    event.preventDefault();
    event.stopPropagation();
    release();
  };
  const restart = (event: Event) => {
    if (event !== source) release();
  };
  const release = () => {
    window.removeEventListener("click", swallow, true);
    window.removeEventListener("pointerdown", restart, true);
    window.removeEventListener("pointercancel", restart, true);
    window.removeEventListener("keydown", release, true);
  };
  window.addEventListener("click", swallow, true);
  window.addEventListener("pointerdown", restart, true);
  window.addEventListener("pointercancel", restart, true);
  window.addEventListener("keydown", release, true);
}

/**
 * Close an open overlay on Escape or a pointerdown outside `ref`. Pass `null`
 * for `ref` when what counts as inside isn't one element, and say so with
 * `ignore` instead.
 *
 * The pointerdown listener is capture-phase: a bubble-phase one is blinded by
 * any handler in between that stops propagation, and an overlay cannot know
 * what it is layered over. `onDismiss` and `ignore` must be stable (wrap in
 * useCallback) so the listeners aren't re-bound every render while open.
 */
export function useDismiss(
  open: boolean,
  onDismiss: () => void,
  ref: RefObject<HTMLElement | SVGElement | null> | null,
  {
    behavior = "pass-through",
    escape: dismissOnEscape = true,
    ignore,
  }: DismissOptions = {},
) {
  useEffect(() => {
    if (!open) return;
    const inside = (target: Element) =>
      Boolean(ref?.current?.contains(target)) || Boolean(ignore?.(target));
    const onKey = (event: KeyboardEvent) => {
      if (dismissOnEscape && event.key === "Escape") onDismiss();
    };
    const onPointer = (event: PointerEvent) => {
      const target = event.target as Element | null;
      if (!target || inside(target)) return;
      // Outside this overlay, but inside one that is also open: the gesture is
      // that overlay's to answer, and swallowing its click from behind would
      // cost the user the control they actually aimed at.
      if (behavior === "consume" && !claimedByAnotherScope(inside, target)) {
        consumeActivation(event);
      }
      onDismiss();
    };
    openScopes.add(inside);
    window.addEventListener("keydown", onKey);
    window.addEventListener("pointerdown", onPointer, true);
    return () => {
      openScopes.delete(inside);
      window.removeEventListener("keydown", onKey);
      window.removeEventListener("pointerdown", onPointer, true);
    };
  }, [open, onDismiss, ref, behavior, dismissOnEscape, ignore]);
}

"use client";

import { useMemo, useRef } from "react";
import { isHoveringPointer } from "@/lib/touch";

interface BoundaryEvent {
  pointerId: number;
  pointerType: string;
  buttons: number;
}

export interface HoverGesture {
  /** True when this enter starts a hover: the pointer arrived resting, not pressing. */
  enter: (event: BoundaryEvent) => boolean;
  /** True when this leave ends a hover that entered as one. */
  leave: (event: BoundaryEvent) => boolean;
}

/**
 * Pairs a surface's enter with its leave, per pointer.
 *
 * `isHoveringPointer` answers the question the *enter* asks — is this pointer
 * resting on the surface or pressing it — and both boundary cases go wrong if
 * the leave is asked the same question again:
 *
 * - A pen with no hover never rests. It arrives in contact, taps, and the spec
 *   then requires its boundary events after `pointerup`, so the leave carries
 *   `buttons: 0` and reads as a mouse gliding off. Hover teardown then undid
 *   the tap — the panel the pen had just opened closed under it.
 * - A mouse pressed on the surface and dragged off leaves with `buttons: 1`.
 *   Skipping teardown there strands the surface open: the release happens
 *   outside, and no second leave ever comes.
 *
 * So the state a hover holds is released by the pointer that took it, whatever
 * the buttons say at the boundary, and a pointer that arrived in contact never
 * took it in the first place. Contact is the exception tracked here, not
 * hover: a leave from a pointer this surface never saw enter — mounted under
 * the cursor, say — still counts, since the alternative is state with no way
 * out.
 */
export function useHoverGesture(): HoverGesture {
  const contact = useRef(new Set<number>());

  return useMemo(
    () => ({
      enter: (event) => {
        if (isHoveringPointer(event)) {
          contact.current.delete(event.pointerId);
          return true;
        }
        contact.current.add(event.pointerId);
        return false;
      },
      leave: (event) => {
        const arrivedInContact = contact.current.delete(event.pointerId);
        return !arrivedInContact && event.pointerType !== "touch";
      },
    }),
    [],
  );
}

"use client";

import { useMemo, useRef } from "react";

/** What a pointerdown recorded, read back by the click that ends its gesture. */
export interface TapRecord<S> {
  /** Which input started the gesture. */
  pointerType: string;
  /** What the surface was showing when it started. */
  state: S;
}

export interface TapGesture<S> {
  /** Record the gesture a pointerdown starts, with the state it starts in. */
  start: (event: { pointerType: string }, state: S) => void;
  /** Read the record and clear it. `null` when no pointer is behind this click. */
  take: () => TapRecord<S> | null;
  /** Drop the record: this gesture will never spend it on a click. */
  drop: () => void;
}

/**
 * The pointer gesture behind a click, recorded where the click cannot report
 * it. A `click` carries no `pointerType` in the engines that matter, so the
 * `pointerdown` before it is the only thing that says which input activated
 * the control — and whether one did at all, since keyboard activation
 * synthesizes a click with no pointer behind it.
 *
 * State goes in with the record because a click reports that no better: a
 * browser that focuses a control on contact can open the very panel the tap
 * was meant to open, and reading "is it open" at click time then undoes it.
 * What the gesture started against is what it acts on.
 *
 * The record is spent by one click and dropped by everything else, because a
 * record that outlives its gesture is worse than none:
 *
 * - A scroll or an OS gesture takes the touch away — `pointercancel`, no click
 *   ever — and the finger would sit in the record until some later click.
 * - That later click is often `Enter` on a keyboard, which arrives with no
 *   pointerdown of its own and would inherit the abandoned finger. A keydown
 *   is the start of a keyboard activation and never part of a tap, so it drops
 *   the record too.
 *
 * Both ends have to be wired by the surface: `drop` on `onPointerCancel` and
 * on `onKeyDown`.
 */
export function useTapGesture<S>(): TapGesture<S> {
  const record = useRef<TapRecord<S> | null>(null);

  return useMemo(
    () => ({
      start: (event, state) => {
        record.current = { pointerType: event.pointerType, state };
      },
      take: () => {
        const spent = record.current;
        record.current = null;
        return spent;
      },
      drop: () => {
        record.current = null;
      },
    }),
    [],
  );
}

// Shared touch primitives. iOS and iPadOS run their own gestures on top of the
// page — the long-press selection callout and the selection it drags in with
// it — and they win: once the platform claims a touch it cancels ours
// mid-gesture, so a press-and-hold or a drag simply dies. Surfaces that own
// their gesture have to opt out.
//
// What the two classes below cover, precisely:
// - `-webkit-touch-callout: none` stops iOS's long-press callout. WebKit-only:
//   it is not a property other engines have, so it is inert everywhere else.
// - `user-select: none` stops the long-press selection on every engine,
//   Android included, and stops a drag from painting a selection under the
//   cursor. It is inherited, so it reaches every descendant — which is why the
//   two classes differ only in whether they apply it unconditionally.
// What neither covers:
// - Chrome for Android's long-press menu on a link or an image. No CSS
//   suppresses it; a gesture surface that wraps one needs its own
//   `onContextMenu` with `preventDefault()`.
// - The native drag of an `<img>` or `<a>` descendant. `-webkit-user-drag` is
//   not inherited and plain divs and buttons are not drag sources, so setting
//   it on the surface does nothing — the child itself needs `draggable={false}`.

/**
 * Classes for a surface that *is* the control: a thumb, a drum, a stage, a
 * handle, a hold button. Selection is suppressed on every input, because a
 * drag that highlights the control's own label is wrong on a mouse too.
 * Compose with `touch-none` when the surface also owns the scroll axis — leave
 * it off when the page must still scroll from there.
 */
export const TOUCH_GESTURE_CLASS = "select-none [-webkit-touch-callout:none]";

/**
 * The same opt-out for a gesture surface that wraps content the consumer owns:
 * a scroller, a context-menu trigger, a sheet header, a list row. Selection is
 * suppressed only where the platform runs its own press gestures — a coarse
 * pointer — so a mouse user can still select and copy that content. If the
 * gesture itself would paint a selection under the cursor, add `select-none`
 * for the duration of the gesture rather than reaching for
 * `TOUCH_GESTURE_CLASS`.
 *
 * `pointer: coarse` describes the *primary* pointer and nothing else, so a
 * hybrid machine reads it wrong in both directions: a tablet with a mouse
 * plugged in keeps touch as primary and loses mouse selection, and a laptop
 * with a touchscreen keeps the mouse as primary and leaves selection live
 * under a finger. No media query can answer per interaction — the query is
 * about the device, and the question is about the gesture in progress. The
 * default stays here because it is right on the machines that are one thing or
 * the other, and losing a selection is a nuisance; where the miss costs a
 * *gesture* instead, the surface pairs it with `holdSelection` on the press.
 */
export const TOUCH_GESTURE_CONTENT_CLASS =
  "[-webkit-touch-callout:none] pointer-coarse:select-none";

/**
 * Suppress selection on `element` for as long as a gesture is running on it,
 * whatever the primary pointer of the machine happens to be. Returns the
 * release. Inline, so it wins over the class above and is gone again the
 * moment the gesture ends.
 *
 * For the press gestures a native selection would otherwise steal — a
 * long-press that opens a menu. Elsewhere prefer the classes: a surface that
 * takes selection away for the whole session is a surface whose text nobody
 * can copy.
 */
export function holdSelection(element: HTMLElement) {
  element.style.setProperty("user-select", "none");
  element.style.setProperty("-webkit-user-select", "none");
  return () => {
    element.style.removeProperty("user-select");
    element.style.removeProperty("-webkit-user-select");
  };
}

/**
 * Pointer capture, best effort. WebKit throws `NotFoundError` when the pointer
 * is already gone by the time the handler runs — routine on iOS, where the
 * system can claim the touch first — and an uncaught throw takes the rest of
 * the handler, the gesture included, down with it. Touch pointers carry
 * implicit capture anyway, so losing it is never fatal.
 */
export function capturePointer(element: Element, pointerId: number) {
  try {
    element.setPointerCapture(pointerId);
  } catch {
    // Pointer is no longer active — implicit capture still applies on touch.
  }
}

/** Release a capture taken with `capturePointer`, ignoring a stale pointer. */
export function releasePointer(element: Element, pointerId: number) {
  try {
    if (element.hasPointerCapture(pointerId)) {
      element.releasePointerCapture(pointerId);
    }
  } catch {
    // Capture was already dropped by the browser.
  }
}

/**
 * Whether this event came from a pointer that is *hovering*: not a touch, and
 * not currently pressed. Which input the user is holding right now is not
 * something a device capability can answer — a touchscreen laptop hovers and
 * taps, and iPadOS reports a fine hovering pointer for a finger — so both
 * paths stay live and each handler branches on the event it was given.
 *
 * A pen resting on the glass is making contact, not hovering: `buttons` is the
 * tell, and it sends a pen tap down the same route a finger takes.
 *
 * This answers what an *enter* asks. A leave is the other half of a pair and
 * has to be read against the enter that started it — `useHoverGesture` in
 * `lib/hooks/use-hover-gesture` does that, and hover surfaces should use it
 * rather than asking this question twice.
 */
export const isHoveringPointer = (event: {
  pointerType: string;
  buttons: number;
}) => event.pointerType !== "touch" && event.buttons === 0;

"use client";
// beui.dev/charts/composition-chart

import { cn } from "@/lib/utils";
import {
  CompositionContext,
  useCompositionModel,
  type CompositionChartProps,
} from "./composition-chart/context";
import { CompositionChartPlot } from "./composition-chart/plot";
import { CompositionChartLegend } from "./composition-chart/legend";

/** Normalized stacked shares. Zero-total or incomplete periods are shown as gaps. */
export function CompositionChart({ className, children, ...props }: CompositionChartProps) {
  const model = useCompositionModel(props);
  return (
    <CompositionContext.Provider value={model}>
      <section aria-label={model.label} className={cn("@container w-full space-y-4", className)}>
        {children === undefined ? (
          <div className="grid gap-4">
            <CompositionChartPlot />
            <CompositionChartLegend />
          </div>
        ) : (
          children
        )}
      </section>
    </CompositionContext.Provider>
  );
}

export { CompositionChartPlot } from "./composition-chart/plot";
export { CompositionChartLegend } from "./composition-chart/legend";
export { useCompositionChart } from "./composition-chart/context";
export type { CompositionChartProps } from "./composition-chart/context";
export type { CompositionSeries as CompositionChartSeries } from "./composition-chart/model";

"use client";

import { createContext, useContext, useMemo, useState, type ReactNode } from "react";
import { useReducedMotion } from "motion/react";
import { useHoverCapable } from "@/lib/hooks/use-hover-capable";
import { buildComposition, type CompositionSeries } from "./model";

export interface CompositionChartProps {
  series: readonly CompositionSeries[];
  /** Unique labels in chronological order. */
  periods: readonly string[];
  view?: "bar" | "area";
  period?: string;
  defaultPeriod?: string;
  onPeriodChange?: (period: string) => void;
  formatValue?: (value: number) => string;
  label?: string;
  className?: string;
  children?: ReactNode;
}

const number = new Intl.NumberFormat("en", { maximumFractionDigits: 2 });
export function useCompositionModel({
  series,
  periods,
  view = "bar",
  period,
  defaultPeriod,
  onPeriodChange,
  formatValue = (value) => number.format(value),
  label = "Composition over time",
}: CompositionChartProps) {
  const model = useMemo(() => buildComposition(series, periods), [series, periods]);
  const [internal, setInternal] = useState(defaultPeriod);
  const [pinned, setPinned] = useState<string | null>(null);
  const [hovered, setHovered] = useState<string | null>(null);
  const [focused, setFocused] = useState<string | null>(null);
  const validSeries = (id: string | null) => model.rows.some((row) => row.id === id);
  if (internal !== undefined && !model.columns.some((column) => column.id === internal))
    setInternal(undefined);
  if (pinned !== null && !validSeries(pinned)) setPinned(null);
  if (hovered !== null && !validSeries(hovered)) setHovered(null);
  if (focused !== null && !validSeries(focused)) setFocused(null);
  const selected = period === undefined ? internal : period;
  const found = model.columns.findIndex((column) => column.id === selected);
  const index = found >= 0 ? found : model.columns.length - 1;
  const select = (next: string) => {
    if (period === undefined) setInternal(next);
    if (next !== model.columns[index]?.id) onPeriodChange?.(next);
  };
  const highlight = [hovered, focused, pinned].find((id) => id !== null && validSeries(id)) ?? null;
  return {
    ...model,
    index,
    column: model.columns[index],
    select,
    view,
    label,
    formatValue,
    pinned,
    setPinned,
    highlight,
    setHovered,
    setFocused,
    reduce: useReducedMotion(),
    canHover: useHoverCapable(),
  };
}

export const CompositionContext = createContext<ReturnType<typeof useCompositionModel> | null>(
  null,
);
export function useCompositionChart() {
  const context = useContext(CompositionContext);
  if (!context)
    throw new Error("Composition chart parts must be rendered inside CompositionChart.");
  return context;
}

"use client";

import { cn } from "@/lib/utils";
import { useCompositionChart } from "./context";

export function CompositionChartLegend({ className }: { className?: string }) {
  const { column, highlight, pinned, setPinned, setHovered, setFocused, canHover, formatValue } =
    useCompositionChart();
  if (!column) return null;
  return (
    <div
      className={cn(
        "grid min-w-0 grid-cols-2 gap-x-4 gap-y-1 @min-[480px]:grid-cols-3 @min-[900px]:grid-cols-6",
        className,
      )}
    >
      {column.segments.map((row) => (
        <button
          key={row.id}
          type="button"
          aria-label={`Highlight ${row.name}`}
          aria-pressed={pinned === row.id}
          onClick={() => setPinned(pinned === row.id ? null : row.id)}
          onPointerEnter={() => {
            if (canHover) setHovered(row.id);
          }}
          onPointerLeave={() => setHovered(null)}
          onFocus={() => setFocused(row.id)}
          onBlur={() => setFocused(null)}
          onKeyDown={(event) => {
            if (event.key === "Escape") {
              setPinned(null);
              setHovered(null);
              setFocused(null);
            }
          }}
          className={cn(
            "flex min-h-12 min-w-0 items-center gap-2.5 rounded-md px-2 py-1.5 text-left text-xs transition-opacity duration-150 focus-visible:outline-2 focus-visible:outline-offset-2 focus-visible:outline-ring",
            pinned === row.id && "bg-muted/60",
            highlight && highlight !== row.id && "opacity-40",
          )}
        >
          <span
            aria-hidden="true"
            className="h-6 w-1 shrink-0 rounded-full"
            style={{ backgroundColor: row.color }}
          />
          <span className="grid min-w-0 gap-0.5">
            <span className="truncate text-muted-foreground">{row.name}</span>
            <span
              title={row.value === null ? "Missing value" : formatValue(row.value)}
              className="shrink-0 font-mono tabular-nums"
            >
              {column.valid ? `${row.share.toFixed(1)}%` : "—"}
            </span>
          </span>
        </button>
      ))}
    </div>
  );
}

export interface CompositionSeries {
  id: string;
  name: string;
  color: string;
  /** Nonnegative values aligned with periods. Missing/invalid values leave a gap. */
  values: readonly (number | null)[];
}

export function buildComposition(series: readonly CompositionSeries[], periods: readonly string[]) {
  const seen = new Set<string>();
  const rows = series.filter((row) => {
    if (seen.has(row.id)) return false;
    seen.add(row.id);
    return true;
  });
  const periodIds = new Set<string>();
  const columns = periods.flatMap((id, index) => {
    if (periodIds.has(id)) return [];
    periodIds.add(id);
    const values = rows.map((row) => row.values[index]);
    const valid =
      values.length > 0 &&
      values.every((v) => typeof v === "number" && Number.isFinite(v) && v >= 0);
    // Scale before summing so large finite input values cannot overflow shares.
    const max = valid ? Math.max(0, ...values.map((v) => v ?? 0)) : 0;
    const scaledTotal = max > 0 ? values.reduce<number>((sum, v) => sum + (v ?? 0) / max, 0) : 0;
    let offset = 0;
    const segments = rows.map((row, i) => {
      const value = values[i] ?? null;
      const share = scaledTotal > 0 ? ((value ?? 0) / max / scaledTotal) * 100 : 0;
      const segment = { ...row, value, share, offset };
      offset += share;
      return segment;
    });
    return [{ id, valid: valid && scaledTotal > 0, segments }];
  });
  return { rows, columns };
}

/** Separate polygons for contiguous runs; unknown periods never become interpolated data. */
export function compositionArea(
  columns: ReturnType<typeof buildComposition>["columns"],
  row: number,
) {
  const paths: string[] = [];
  let run: number[] = [];
  const flush = () => {
    if (!run.length) return;
    const top = run.map((index) => {
      const segment = columns[index].segments[row];
      return `${((index + 0.5) / columns.length) * 100},${100 - segment.offset - segment.share}`;
    });
    const bottom = [...run]
      .reverse()
      .map(
        (index) =>
          `${((index + 0.5) / columns.length) * 100},${100 - columns[index].segments[row].offset}`,
      );
    // A single sample gets a column-width footprint instead of an invisible polygon.
    if (run.length === 1) {
      const index = run[0];
      const segment = columns[index].segments[row];
      const left = (index / columns.length) * 100;
      const right = ((index + 1) / columns.length) * 100;
      paths.push(
        `M${left},${100 - segment.offset} L${left},${100 - segment.offset - segment.share} L${right},${100 - segment.offset - segment.share} L${right},${100 - segment.offset} Z`,
      );
    } else paths.push(`M${top.join(" L")} L${bottom.join(" L")} Z`);
    run = [];
  };
  columns.forEach((column, index) => {
    if (column.valid) run.push(index);
    else flush();
  });
  flush();
  return paths.join(" ");
}

"use client";

import { useId, useRef, useState, type PointerEvent } from "react";
import { Tooltip } from "@/components/motion/tooltip";
import { CompositionTooltipContent } from "./tooltip-content";
import { motion } from "motion/react";
import { cn } from "@/lib/utils";
import { SPRING_LAYOUT } from "@/lib/ease";
import { useCompositionChart } from "./context";
import { compositionArea } from "./model";

export function CompositionChartPlot({ className }: { className?: string }) {
  const { columns, rows, column, index, select, view, highlight, reduce, canHover } =
    useCompositionChart();
  const anchorRef = useRef<HTMLDivElement>(null);
  const tooltipId = useId();
  const pointerDriven = useRef(false);
  const [tooltipOpen, setTooltipOpen] = useState(false);
  const inspectPointer = (event: PointerEvent<HTMLDivElement>) => {
    const bounds = event.currentTarget.getBoundingClientRect();
    if (!bounds.width || !bounds.height || !columns.length) return;
    const x = Math.min(1, Math.max(0, (event.clientX - bounds.left) / bounds.width));
    select(columns[Math.min(columns.length - 1, Math.floor(x * columns.length))].id);
  };
  if (!columns.length || !rows.length)
    return (
      <p
        className={cn(
          "flex min-h-64 items-center justify-center text-sm text-muted-foreground",
          className,
        )}
      >
        No composition data
      </p>
    );
  return (
    <div className={cn("min-w-0 space-y-3", className)}>
      <div className="flex justify-between text-[11px] text-muted-foreground">
        <span>
          {column?.id}
          {column?.valid ? "" : " · No data"}
        </span>
        <span className="font-mono">100%</span>
      </div>
      <div
        ref={anchorRef}
        onPointerLeave={() => setTooltipOpen(false)}
        className="relative h-64 has-focus-visible:outline-2 has-focus-visible:outline-offset-4 has-focus-visible:outline-ring sm:h-80"
        onPointerEnter={(event) => {
          if (event.pointerType !== "touch" && !event.buttons) {
            inspectPointer(event);
            setTooltipOpen(true);
          }
        }}
        onPointerDown={(event) => {
          pointerDriven.current = true;
          inspectPointer(event);
          setTooltipOpen(true);
        }}
        onPointerUp={() => {
          pointerDriven.current = false;
        }}
        onPointerCancel={() => {
          pointerDriven.current = false;
          setTooltipOpen(false);
        }}
        onPointerMove={(event) => {
          if (event.pointerType === "touch" ? event.buttons === 1 : canHover) {
            inspectPointer(event);
          }
        }}
      >
        <svg
          aria-hidden="true"
          viewBox="0 0 100 100"
          preserveAspectRatio="none"
          className="size-full overflow-visible"
        >
          {[0, 25, 50, 75, 100].map((y) => (
            <line
              key={y}
              x1="0"
              x2="100"
              y1={y}
              y2={y}
              stroke="currentColor"
              strokeWidth="1"
              vectorEffect="non-scaling-stroke"
              className="text-border"
            />
          ))}
          {view === "area"
            ? rows.map((row, r) => (
                <motion.path
                  key={row.id}
                  d={compositionArea(columns, r)}
                  fill={row.color}
                  initial={{ opacity: 0 }}
                  animate={{ opacity: highlight && highlight !== row.id ? 0.18 : 0.9 }}
                  transition={{ duration: 0.18 }}
                />
              ))
            : columns.map(
                (col, i) =>
                  col.valid &&
                  col.segments.map((segment) => (
                    <motion.rect
                      key={`${col.id}/${segment.id}`}
                      x={(i / columns.length) * 100 + 10 / columns.length}
                      y="0"
                      width={80 / columns.length}
                      height="1"
                      fill={segment.color}
                      initial={false}
                      animate={{
                        y: 100 - segment.offset - segment.share,
                        scaleY: segment.share,
                        opacity: highlight && highlight !== segment.id ? 0.18 : 0.9,
                      }}
                      style={{ originY: "0px", originX: "0px" }}
                      transition={reduce ? { duration: 0 } : SPRING_LAYOUT}
                    />
                  )),
              )}
          <motion.line
            initial={false}
            animate={{ x: ((index + 0.5) / columns.length) * 100 }}
            transition={reduce ? { duration: 0 } : SPRING_LAYOUT}
            x1="0"
            x2="0"
            y1="0"
            y2="100"
            stroke="currentColor"
            strokeWidth="1"
            vectorEffect="non-scaling-stroke"
            strokeDasharray="3 3"
            className="text-foreground/70"
          />
        </svg>
        <input
          type="range"
          aria-label="Inspect period"
          min={0}
          max={columns.length - 1}
          step={1}
          value={index}
          aria-valuetext={column?.id}
          aria-describedby={tooltipOpen ? tooltipId : undefined}
          onFocus={() => setTooltipOpen(true)}
          onBlur={() => {
            pointerDriven.current = false;
            setTooltipOpen(false);
          }}
          onPointerDown={() => setTooltipOpen(true)}
          onKeyDown={(event) => {
            pointerDriven.current = false;
            if (event.key === "Escape") setTooltipOpen(false);
          }}
          onChange={(event) => {
            // The range thumb and equal-width chart columns round differently.
            // Pointer selection has one source; native changes are for keyboard/AT.
            if (pointerDriven.current) return;
            select(columns[Number(event.target.value)].id);
            setTooltipOpen(true);
          }}
          className="absolute inset-0 h-full w-full cursor-crosshair opacity-0"
        />
      </div>
      <Tooltip
        id={tooltipId}
        anchorRef={anchorRef}
        followCursor
        anchorPoint={{ x: (index + 0.5) / columns.length, y: 0.3 }}
        side="top"
        open={tooltipOpen}
        onOpenChange={setTooltipOpen}
        className="max-w-[calc(100vw-1rem)]"
        content={<CompositionTooltipContent />}
      />
      <div className="flex justify-between gap-4 text-[11px] text-muted-foreground">
        <span>{columns[0].id}</span>
        <span>{columns.at(-1)?.id}</span>
      </div>
    </div>
  );
}

"use client";

import { NumberTicker } from "@/components/motion/number-ticker";
import { cn } from "@/lib/utils";
import { useCompositionChart } from "./context";

export function CompositionTooltipContent({ className }: { className?: string }) {
  const { column, formatValue } = useCompositionChart();
  if (!column) return null;
  return (
    <span className={cn("block w-72 max-w-full min-w-0", className)}>
      <span className="mb-2 block text-xs font-medium">{column.id}</span>
      {column.valid ? (
        <span className="grid gap-2">
          {column.segments.map((row) => (
            <span key={row.id} className="flex items-center gap-2 text-[11px]">
              <span
                aria-hidden="true"
                className="size-1.5 shrink-0 rounded-full"
                style={{ backgroundColor: row.color }}
              />
              <span className="min-w-0 flex-1 truncate">{row.name}</span>
              <span className="max-w-28 shrink-0 truncate text-muted-foreground tabular-nums"
                title={formatValue(row.value ?? 0)}>
                <NumberTicker
                  value={row.value ?? 0}
                  // Keep the consumer's exact formatting, including fractional values and units.
                  format={() => formatValue(row.value ?? 0)}
                  startOnView={false}
                  duration={0.2}
                  stagger={0}
                  className="whitespace-pre"
                />
              </span>
              <span className="w-12 shrink-0 text-right font-mono tabular-nums">
                <NumberTicker
                  value={row.share}
                  format={() => row.share.toFixed(1)}
                  suffix="%"
                  startOnView={false}
                  duration={0.2}
                  stagger={0}
                />
              </span>
            </span>
          ))}
        </span>
      ) : (
        <span className="block text-xs text-muted-foreground">
          No complete data for this period.
        </span>
      )}
    </span>
  );
}

"use client";

import { AnimatePresence } from "motion/react";
import { TooltipPositioner } from "./tooltip/positioner";
import { useTooltipPointer } from "./tooltip/use-position";
import {
  cloneElement,
  isValidElement,
  type PointerEvent,
  type ReactElement,
  type ReactNode,
  type RefObject,
  useCallback,
  useEffect,
  useId,
  useRef,
  useState,
} from "react";
import { createPortal } from "react-dom";
import { TooltipSurface } from "@/components/motion/tooltip-surface";
import { useDismiss } from "@/lib/hooks/use-dismiss";
import { useHoverGesture } from "@/lib/hooks/use-hover-gesture";
import { useTapGesture } from "@/lib/hooks/use-tap-gesture";
import { cn } from "@/lib/utils";

type Side = "top" | "right" | "bottom" | "left";

export interface TooltipProps {
  content: ReactNode;
  children?: ReactElement;
  /** Existing trigger for controlled integrations such as chart cells. */
  anchorRef?: RefObject<HTMLElement | SVGElement | null>;
  /** Point within the anchor, as fractions of its rendered width and height. */
  anchorPoint?: { x: number; y: number };
  /** Follow real pointer coordinates; keyboard focus still uses the anchor. */
  followCursor?: boolean;
  open?: boolean;
  onOpenChange?: (open: boolean) => void;
  id?: string;
  side?: Side;
  /** Delay before showing (ms). Default 120. */
  delay?: number;
  className?: string;
  /** Classes for the outer wrapper span. Use to fix baseline / fill parent. */
  wrapperClassName?: string;
}

// Once any tooltip has just closed, neighbouring tooltips open without the
// initial delay — moving along a toolbar feels instant after the first one.
const WARM_WINDOW_MS = 300;
let lastHiddenAt = 0;

export function Tooltip({
  content,
  children,
  side = "top",
  delay = 120,
  className,
  wrapperClassName,
  anchorRef: externalAnchorRef,
  anchorPoint,
  followCursor = false,
  open: controlledOpen,
  onOpenChange,
  id: providedId,
}: TooltipProps) {
  const [internalOpen, setInternalOpen] = useState(false);
  const open = controlledOpen ?? internalOpen;
  const setOpen = useCallback(
    (next: boolean) => {
      if (controlledOpen === undefined) setInternalOpen(next);
      onOpenChange?.(next);
    },
    [controlledOpen, onOpenChange],
  );
  const generatedId = useId();
  const id = providedId ?? generatedId;
  const timer = useRef<ReturnType<typeof setTimeout> | null>(null);
  const wrapperRef = useRef<HTMLSpanElement>(null);
  const anchorRef = externalAnchorRef ?? wrapperRef;
  const hover = useHoverGesture();
  const floatingRef = useRef<HTMLSpanElement | null>(null);
  const pointer = useTooltipPointer(anchorRef, followCursor);
  const focused = useRef(false);

  const show = useCallback(() => {
    if (timer.current) clearTimeout(timer.current);
    if (open) return;
    const warm = Date.now() - lastHiddenAt < WARM_WINDOW_MS;
    if (warm) {
      setOpen(true);
      return;
    }
    timer.current = setTimeout(() => {
      setOpen(true);
    }, delay);
  }, [delay, setOpen, open]);

  const hide = useCallback(() => {
    if (timer.current) {
      clearTimeout(timer.current);
      timer.current = null;
    }
    if (open) lastHiddenAt = Date.now();
    setOpen(false);
  }, [open, setOpen]);

  const leave = useCallback(() => {
    if (focused.current) return;
    if (timer.current) clearTimeout(timer.current);
    // Bridge the small physical gap to a stationary, readable tooltip.
    if (followCursor) hide();
    else timer.current = setTimeout(hide, 100);
  }, [followCursor, hide]);
  const insideTooltip = useCallback(
    (target: Element) => Boolean(floatingRef.current?.contains(target)),
    [],
  );

  // A finger never hovers, and Safari does not focus a button on tap either, so
  // the label is only reachable if the tap itself opens the tooltip. A click
  // carries no pointerType, so the pointerdown that preceded it is what says
  // whether this was a tap; keyboard activation arrives with no pointerdown at
  // all, and focus has already shown the label there.
  const tap = useTapGesture<boolean>();

  const toggleOnTap = useCallback(() => {
    const gesture = tap.take();
    if (!gesture || gesture.pointerType === "mouse") return;
    if (gesture.state) {
      hide();
      return;
    }
    if (timer.current) clearTimeout(timer.current);
    setOpen(true);
  }, [hide, tap, setOpen]);

  // ...and closed again by the next tap that lands somewhere else. The label
  // covers nothing interactive, so that tap passes through to what it hit.
  useDismiss(open, hide, anchorRef, { ignore: insideTooltip });

  useEffect(
    () => () => {
      if (timer.current) clearTimeout(timer.current);
    },
    [],
  );

  if (!externalAnchorRef && !isValidElement(children)) return children;

  // The label describes the trigger, so it has to name the trigger itself.
  // Everything else the tooltip needs is read off the anchor below instead of
  // cloned on: a handler written onto the child is the child's handler as far
  // as that child can tell, and a component that owns its activation —
  // hard-wiring onClick and spreading the rest of its props over it, as
  // ThemeToggle does — then runs the tooltip's instead of its own. Composing
  // with `props.onClick` cannot save it either, because a component element's
  // props hold nothing the component does internally.
  const trigger = isValidElement(children)
    ? cloneElement(children as ReactElement<Record<string, unknown>>, {
        "aria-describedby":
          [(children.props as Record<string, unknown>)["aria-describedby"], open ? id : undefined]
            .filter(Boolean)
            .join(" ") || undefined,
      })
    : null;

  return (
    <>
      {!externalAnchorRef ? (
        // biome-ignore lint/a11y/noStaticElementInteractions: This wrapper observes bubbling trigger events without replacing the control's handlers.
        <span
          ref={wrapperRef}
          className={cn("relative inline-flex align-middle", wrapperClassName)}
          // Pointer events, not the mouse pair: a tap fires compatibility
          // mouseenter/mouseleave that carry no pointerType, which raced the tap
          // path into opening and closing the same label.
          onPointerEnter={(event: PointerEvent) => {
            if (hover.enter(event)) show();
          }}
          onPointerLeave={(event: PointerEvent) => {
            if (hover.leave(event)) leave();
          }}
          onFocus={() => {
            focused.current = true;
            show();
          }}
          onBlur={() => {
            focused.current = false;
            hide();
          }}
          onPointerDown={(event: PointerEvent) => tap.start(event, open)}
          // A gesture the platform took away sends no click, and a key press
          // starts an activation that never had a pointer behind it. Either way
          // the record has to go, or the next click reads a finger that has long
          // since lifted.
          onPointerCancel={tap.drop}
          onKeyDown={(event) => {
            tap.drop();
            if (event.key === "Escape") hide();
          }}
          onClick={toggleOnTap}
        >
          {trigger}
        </span>
      ) : null}
      {typeof document !== "undefined"
        ? createPortal(
            <AnimatePresence>
              {open ? (
                <TooltipPositioner
                  key="tooltip"
                  anchorRef={anchorRef}
                  floatingRef={floatingRef}
                  anchorPoint={anchorPoint}
                  followCursor={followCursor}
                  side={side}
                  onDismiss={hide}
                  pointer={pointer}
                >
                  {(positioned, isPresent) => (
                    <TooltipSurface
                      id={id}
                      ready={positioned}
                      side={side}
                      onPointerEnter={() => {
                        if (timer.current) clearTimeout(timer.current);
                      }}
                      onPointerLeave={leave}
                      style={{
                        maxWidth: "calc(100vw - 16px)",
                        whiteSpace: "normal",
                        pointerEvents: isPresent && !followCursor ? "auto" : "none",
                      }}
                      className={cn("overflow-hidden", className)}
                    >
                      {content}
                    </TooltipSurface>
                  )}
                </TooltipPositioner>
              ) : null}
            </AnimatePresence>,
            document.body,
          )
        : null}
    </>
  );
}

"use client";

import { animate, motion, useInView, useReducedMotion } from "motion/react";
import { useEffect, useMemo, useRef, useState } from "react";
import { EASE_OUT } from "@/lib/ease";
import { cn } from "@/lib/utils";

export interface NumberTickerProps {
  value: number;
  /** Digits to pad to (left). */
  pad?: number;
  /** Per-digit roll duration in seconds. */
  duration?: number;
  /** Stagger between digits. */
  stagger?: number;
  /** Render only after the element enters the viewport. */
  startOnView?: boolean;
  prefix?: string;
  suffix?: string;
  /** Add a small blur during digit rolls. */
  blur?: boolean;
  className?: string;
  digitClassName?: string;
  /** Insert locale group separators (commas). Server-component safe. */
  locale?: boolean;
  /** Custom formatter. Client-only — server components must use `locale` instead. */
  format?: (value: number) => string;
}

const DIGIT_HEIGHT_EM = 1.1;
const DIGITS = Array.from({ length: 10 }, (_, n) => n);

export function NumberTicker({
  value,
  pad,
  duration = 0.9,
  stagger = 0.04,
  startOnView = true,
  prefix,
  suffix,
  blur = false,
  className,
  digitClassName,
  locale,
  format,
}: NumberTickerProps) {
  const containerRef = useRef<HTMLSpanElement>(null);
  const inView = useInView(containerRef, { once: true, amount: 0.6 });
  const [armed, setArmed] = useState(!startOnView);

  useEffect(() => {
    if (startOnView && inView) setArmed(true);
  }, [startOnView, inView]);

  const text = useMemo(() => {
    const rounded = Math.round(value);
    const formatted = format
      ? format(rounded)
      : locale
        ? rounded.toLocaleString()
        : rounded.toString();
    return pad ? formatted.padStart(pad, "0") : formatted;
  }, [value, pad, format, locale]);
  const glyphs = useMemo(() => {
    const chars = text.split("");
    // Key by place value (position from the right): a changing digit keeps its
    // identity and rolls to the new value instead of remounting and replaying
    // from 0. Growing numbers add glyphs on the left without re-keying the
    // ones, tens, hundreds already on screen.
    return chars.map((char, i) => ({ char, id: `g-${chars.length - 1 - i}` }));
  }, [text]);
  const readableText = `${prefix ?? ""}${text}${suffix ?? ""}`;

  // Stagger is an entrance flourish. Once the reveal has played, value
  // changes roll every digit immediately — a per-digit delay on live updates
  // reads as lag.
  const [entered, setEntered] = useState(false);
  useEffect(() => {
    if (!armed || entered) return;
    const total = (duration + glyphs.length * stagger) * 1000;
    const t = window.setTimeout(() => setEntered(true), total);
    return () => window.clearTimeout(t);
  }, [armed, entered, duration, stagger, glyphs.length]);

  return (
    <span
      ref={containerRef}
      className={cn("inline-flex items-center tabular-nums", className)}
    >
      <span className="sr-only">{readableText}</span>
      <span aria-hidden="true" className="inline-flex items-center">
        {prefix ? <span>{prefix}</span> : null}
        {glyphs.map(({ char, id }, i) => {
          const isDigit = /\d/.test(char);
          if (!isDigit) {
            return (
              <span key={id} className="inline-block">
                {char}
              </span>
            );
          }
          const digit = Number(char);
          return (
            <Digit
              key={id}
              digit={armed ? digit : 0}
              delay={entered ? 0 : i * stagger}
              duration={duration}
              blur={blur}
              className={digitClassName}
            />
          );
        })}
        {suffix ? <span>{suffix}</span> : null}
      </span>
    </span>
  );
}

function Digit({
  digit,
  delay,
  duration,
  blur,
  className,
}: {
  digit: number;
  delay: number;
  duration: number;
  blur: boolean;
  className?: string;
}) {
  const reduce = useReducedMotion();
  const columnRef = useRef<HTMLSpanElement>(null);

  useEffect(() => {
    if (reduce || !blur || !columnRef.current || !Number.isFinite(digit)) {
      return;
    }

    const node = columnRef.current;
    const controls = animate(
      node,
      { filter: ["blur(10px)", "blur(0px)"] },
      {
        duration: Math.min(duration * 0.75, 0.32),
        delay,
        ease: EASE_OUT,
      },
    );

    return () => {
      controls.stop();
      node.style.filter = "blur(0px)";
    };
  }, [blur, delay, digit, duration, reduce]);

  return (
    <span
      className={cn("relative inline-block overflow-hidden", className)}
      style={{ height: `${DIGIT_HEIGHT_EM}em`, width: "1ch" }}
    >
      <motion.span
        ref={columnRef}
        initial={{ y: 0 }}
        animate={{ y: `-${digit * DIGIT_HEIGHT_EM}em` }}
        transition={
          reduce
            ? { duration: 0 }
            : { duration, delay, ease: EASE_OUT }
        }
        className="absolute inset-x-0 top-0 flex flex-col items-center will-change-[transform,filter]"
      >
        {DIGITS.map((n) => (
          <span
            key={n}
            className="flex h-[1.1em] items-center justify-center leading-none"
          >
            {n}
          </span>
        ))}
      </motion.span>
    </span>
  );
}

"use client";

import { useIsPresent } from "motion/react";
import { useCallback, useState, type ReactNode } from "react";
import { useTooltipPosition } from "./use-position";

type PositionProps = Parameters<typeof useTooltipPosition>[0];

/** Readiness lives with the mounted overlay, not a trigger ref's attach/detach cycle. */
export function TooltipPositioner({
  children,
  ...position
}: Omit<PositionProps, "open" | "onPosition"> & {
  children: (ready: boolean, present: boolean) => ReactNode;
}) {
  const present = useIsPresent();
  const [ready, setReady] = useState(false);
  const onPosition = useCallback(() => setReady(true), []);
  useTooltipPosition({ ...position, open: present, onPosition });
  return (
    <span
      ref={position.floatingRef}
      inert={!present}
      aria-hidden={!present || undefined}
      className="pointer-events-none fixed left-0 top-0 z-[9999] w-max"
      style={{ visibility: "hidden", maxWidth: "calc(100vw - 16px)" }}
    >
      {children(ready, present)}
    </span>
  );
}

"use client";

import {
  autoUpdate,
  computePosition,
  flip,
  offset,
  shift,
  type Placement,
  type VirtualElement,
} from "@floating-ui/dom";
import { useCallback, useLayoutEffect, useRef, type RefObject } from "react";

export type TooltipSide = "top" | "right" | "bottom" | "left";
export type TooltipPoint = { x: number; y: number };

/** Position is geometry, not animation. One write per frame, never a spring chasing a pointer. */
export function useTooltipPosition({
  open,
  anchorRef,
  floatingRef,
  anchorPoint,
  followCursor,
  side,
  onDismiss,
  onPosition,
  pointer,
}: {
  open: boolean;
  anchorRef: RefObject<HTMLElement | SVGElement | null>;
  floatingRef: RefObject<HTMLSpanElement | null>;
  anchorPoint?: TooltipPoint;
  followCursor: boolean;
  side: TooltipSide;
  onDismiss: () => void;
  onPosition: () => void;
  pointer: ReturnType<typeof useTooltipPointer>;
}) {
  const { cursor, onMove } = pointer;
  const cursorSide = useRef<Placement | null>(null);
  useLayoutEffect(() => {
    cursorSide.current = open ? side : null;
  }, [open, side]);
  const frame = useRef<number | null>(null);
  const version = useRef(0);
  const update = useRef<() => void>(() => {});
  const schedule = useCallback(() => {
    // Invalidate older async calculations as soon as new geometry is requested.
    version.current++;
    if (frame.current !== null) return;
    frame.current = requestAnimationFrame(() => {
      frame.current = null;
      update.current();
    });
  }, []);
  useLayoutEffect(() => {
    onMove.current = schedule;
    return () => {
      onMove.current = null;
    };
  }, [onMove, schedule]);
  const pointX = anchorPoint?.x;
  const pointY = anchorPoint?.y;

  // Latest committed inputs are read without recreating observers for every period/content update.
  useLayoutEffect(() => {
    update.current = () => {
      const anchor = anchorRef.current;
      const floating = floatingRef.current;
      if (!open || !anchor || !floating) return;
      const revision = ++version.current;
      const currentCursor = followCursor ? cursor.current : null;
      const reference: Element | VirtualElement =
        currentCursor || pointX !== undefined || pointY !== undefined
          ? {
              contextElement: anchor,
              getBoundingClientRect: () => {
                const rect = anchor.getBoundingClientRect();
                const x = currentCursor?.x ?? rect.left + rect.width * (pointX ?? 0.5);
                const y = currentCursor?.y ?? rect.top + rect.height * (pointY ?? 0.5);
                return { x, y, left: x, right: x, top: y, bottom: y, width: 0, height: 0 };
              },
            }
          : anchor;
      void computePosition(reference, floating, {
        strategy: "fixed",
        placement: currentCursor ? (cursorSide.current ?? side) : side,
        middleware: [offset(currentCursor ? 12 : 8), flip({ padding: 8 }), shift({ padding: 8 })],
      }).then(({ x, y, placement }) => {
        if (version.current !== revision || !floating.isConnected) return;
        // Hold the chosen side for this hover session. Crossing a flip threshold
        // repeatedly must not bounce the surface above and below the pointer.
        if (currentCursor) cursorSide.current = placement;
        else cursorSide.current = null;
        const dpr = window.devicePixelRatio || 1;
        floating.style.transform = `translate3d(${Math.round(x * dpr) / dpr}px, ${Math.round(y * dpr) / dpr}px, 0)`;
        const origin = {
          top: "center bottom",
          bottom: "center top",
          left: "right center",
          right: "left center",
        };
        floating.style.setProperty(
          "--tooltip-origin",
          origin[placement.split("-")[0] as TooltipSide],
        );
        floating.style.visibility = "visible";
        floating.dataset.placement = placement;
        onPosition();
      });
    };
    if (open) schedule();
  }, [
    open,
    anchorRef,
    floatingRef,
    followCursor,
    pointX,
    pointY,
    side,
    schedule,
    onPosition,
    cursor,
  ]);

  useLayoutEffect(() => {
    const anchor = anchorRef.current;
    const floating = floatingRef.current;
    if (!open || !anchor || !floating) return;
    const stop = autoUpdate(anchor, floating, schedule);
    const onScroll = () => {
      // A stationary pointer no longer describes the same chart point after scrolling.
      if (followCursor && cursor.current) onDismiss();
    };
    window.addEventListener("scroll", onScroll, true);
    return () => {
      stop();
      window.removeEventListener("scroll", onScroll, true);
      version.current++;
      if (frame.current !== null) cancelAnimationFrame(frame.current);
      frame.current = null;
    };
  }, [open, anchorRef, floatingRef, followCursor, onDismiss, schedule, cursor]);

  useLayoutEffect(
    () => () => {
      version.current++;
      if (frame.current !== null) cancelAnimationFrame(frame.current);
    },
    [],
  );
}

/** Pointer lifetime belongs to the trigger, including the opening delay. */
export function useTooltipPointer(
  anchorRef: RefObject<HTMLElement | SVGElement | null>,
  followCursor: boolean,
) {
  const cursor = useRef<TooltipPoint | null>(null);
  const onMove = useRef<(() => void) | null>(null);
  const pointerFocus = useRef(false);
  useLayoutEffect(() => {
    const anchor = anchorRef.current;
    if (!anchor || !followCursor) return;
    const point = (event: PointerEvent) => {
      if (event.type === "pointermove" && event.pointerType === "touch" && !event.buttons) return;
      cursor.current = { x: event.clientX, y: event.clientY };
      if (event.type === "pointerdown") pointerFocus.current = true;
      onMove.current?.();
    };
    const keyboard = () => {
      cursor.current = null;
      pointerFocus.current = false;
      onMove.current?.();
    };
    const focus = () => {
      if (!pointerFocus.current) cursor.current = null;
      pointerFocus.current = false;
      onMove.current?.();
    };
    const leave = () => {
      cursor.current = null;
    };
    anchor.addEventListener("pointerenter", point as EventListener, { passive: true });
    anchor.addEventListener("pointermove", point as EventListener, { passive: true });
    anchor.addEventListener("pointerdown", point as EventListener, { passive: true });
    anchor.addEventListener("pointerleave", leave);
    anchor.addEventListener("pointercancel", leave);
    anchor.addEventListener("keydown", keyboard);
    anchor.addEventListener("focusin", focus);
    return () => {
      cursor.current = null;
      anchor.removeEventListener("pointerenter", point as EventListener);
      anchor.removeEventListener("pointermove", point as EventListener);
      anchor.removeEventListener("pointerdown", point as EventListener);
      anchor.removeEventListener("pointerleave", leave);
      anchor.removeEventListener("pointercancel", leave);
      anchor.removeEventListener("keydown", keyboard);
      anchor.removeEventListener("focusin", focus);
    };
  }, [anchorRef, followCursor]);

  return { cursor, onMove };
}